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A detail of a page from Johannes Trithemius, Polygraphiae libri sex , 1518, exercises in cypher alphabets in the first published study of encrypting information. Blaise de Vigenere, Traicté des chiffres , Paris 1586 . Here the message is hidden among the stars and is decoded with a shared text. Giovanni Della Porta, De Furtivis Literarum Notis Vulgo published by the great esoteric in 1591. a figure from John Wilkins' Mercury, or, The secret and swift Messanger; shewing how a man may with Privacy and Speed communicate his Thoughts to a Friend at any distance , London 1641, and a comprehensive account as to how messages may be concealed in words, music, and here geometry.
a spoof inscription see Dickens' satire in Pickwick Papers Bill Stumps his mark "Beneath this stone repose... Tripe Seller" 1756 |
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